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Cheap flights from St. Louis to Sofia from $537

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 4/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
8:21 am - 6:40 pm
STL
-
SOF
26h 19m
2 stops
United Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$537United Airlines
Wed, Apr 22 - Wed, Apr 29
Multiple Airlines Logo
11:42 am - 2:00 pm
STL
-
SOF
18h 18m
2 stops
Multiple Airlines Logo
7:00 am - 11:13 pm
SOF
-
STL
24h 13m
2 stops
$545Multiple Airlines
Wed, Apr 22 - Wed, Apr 29
Multiple Airlines Logo
10:00 am - 12:10 pm
STL
-
SOF
18h 10m
3 stops
Multiple Airlines Logo
6:20 am - 3:24 pm
SOF
-
STL
41h 04m
2 stops
$554Multiple Airlines
Wed, Apr 22 - Wed, Apr 29
Multiple Airlines Logo
12:28 pm - 2:00 pm
STL
-
SOF
17h 32m
2 stops
Multiple Airlines Logo
7:00 am - 11:13 pm
SOF
-
STL
24h 13m
2 stops
$578Multiple Airlines
Wed, Apr 1 - Thu, Apr 30
KLM Logo
12:04 pm - 2:00 pm
STL
-
SOF
17h 56m
2 stops
KLM Logo
7:00 am - 8:44 pm
SOF
-
STL
21h 44m
2 stops
$585KLM
Tue, Apr 7 - Tue, Apr 14
KLM Logo
10:12 am - 2:00 pm
STL
-
SOF
19h 48m
2 stops
KLM Logo
7:00 am - 4:42 pm
SOF
-
STL
17h 42m
2 stops
$597KLM
Tue, Apr 7 - Tue, Apr 14
United Airlines Logo
4:49 pm - 11:00 pm
STL
-
SOF
46h 11m
2 stops
United Airlines Logo
6:10 am - 10:28 pm
SOF
-
STL
24h 18m
2 stops
$601United Airlines
Tue, Apr 7 - Tue, Apr 14
Lufthansa Logo
3:30 pm - 6:05 pm
STL
-
SOF
18h 35m
1 stop
Lufthansa Logo
2:10 pm - 1:25 pm
SOF
-
STL
31h 15m
1 stop
$607Lufthansa
Wed, Apr 1 - Thu, Apr 30
Multiple Airlines Logo
4:05 pm - 6:40 pm
STL
-
SOF
18h 35m
2 stops
Multiple Airlines Logo
6:55 pm - 11:57 pm
SOF
-
STL
37h 02m
2 stops
$608Multiple Airlines
Mon, Apr 6 - Mon, Apr 13
Lufthansa Logo
3:30 pm - 1:25 pm
STL
-
SOF
13h 55m
1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$615Lufthansa
Wed, Apr 22 - Wed, Apr 29

KLM flights from St. Louis to Sofia

Our best KLM deals on St. Louis to Sofia flight tickets
KLM
Apr 7
STL12:04 pmLambert-St Louis
17h 56m
2 stops
SOF2:00 pmSofia
Apr 14
SOF7:00 amSofia
21h 44m
2 stops
STL8:44 pmLambert-St Louis
$585
KLM
Apr 7
STL10:12 amLambert-St Louis
19h 48m
2 stops
SOF2:00 pmSofia
Apr 14
SOF7:00 amSofia
17h 42m
2 stops
STL4:42 pmLambert-St Louis
$597

British Airways flights from St. Louis to Sofia

Our best British Airways deals on St. Louis to Sofia flight tickets
British Airways
Apr 11
STL8:03 pmLambert-St Louis
39h 17m
2 stops
SOF7:20 pmSofia
Jun 17
SOF9:25 pmSofia
34h 29m
2 stops
STL11:54 pmLambert-St Louis
$709
British Airways
Apr 10
STL8:03 pmLambert-St Louis
40h 07m
2 stops
SOF8:10 pmSofia
Jun 17
SOF9:25 pmSofia
34h 29m
2 stops
STL11:54 pmLambert-St Louis
$759

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated February 22, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/22

8:21 am-6:40 pm

2 stops26h 19m

Sofia

Wed 4/29

6:20 am-1:25 pm

1 stop15h 05m

$537

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/22

11:42 am-2:00 pm

2 stops18h 18m

Sofia

Wed 4/29

7:00 am-11:13 pm

2 stops24h 13m

$545

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/22

10:00 am-12:10 pm

3 stops18h 10m

Sofia

Wed 4/29

6:20 am-3:24 pm

2 stops41h 04m

$554

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/1

12:28 pm-2:00 pm

2 stops17h 32m

Sofia

Thu 4/30

7:00 am-11:13 pm

2 stops24h 13m

$578

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/7

12:04 pm-2:00 pm

2 stops17h 56m

Sofia

Tue 4/14

7:00 am-8:44 pm

2 stops21h 44m

$585

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/7

10:12 am-2:00 pm

2 stops19h 48m

Sofia

Tue 4/14

7:00 am-4:42 pm

2 stops17h 42m

$597

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/7

4:49 pm-11:00 pm

2 stops46h 11m

Sofia

Tue 4/14

6:10 am-10:28 pm

2 stops24h 18m

$601

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/1

3:30 pm-6:05 pm

1 stop18h 35m

Sofia

Thu 4/30

2:10 pm-1:25 pm

1 stop31h 15m

$607

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 4/6

4:05 pm-6:40 pm

2 stops18h 35m

Sofia

Mon 4/13

6:55 pm-11:57 pm

2 stops37h 02m

$608

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/22

3:30 pm-1:25 pm

1 stop13h 55m

Sofia

Wed 4/29

6:20 am-1:25 pm

1 stop15h 05m

$615

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Sofia?

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $888 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $791 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 17% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

17h 32m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 17h 32m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 17h 32m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $560Free CancellationRating
7.4
9,341 reviews
Search United Airlines flights
LufthansaPriceFrom $598Free CancellationRating
6.8
7,802 reviews
Search Lufthansa flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

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Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Lufthansa
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